<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="app">
 <div>  {{ a+b }}</div>
 <div> {{a===1?'等于1':'不等于1'}}</div>
 <div>{{friend.name}}</div>
 <div>{{nickname.toUpperCase()}}</div>
 <div></div>
    </div>
    <script src="./vue.js"></script>
    <script>
        const app=new Vue({
            el:'#app',
            data:{
                nickname:'tony',
                age:'18',
                a:1,
                b:1,
                friend:{
                    name:'jack',
                    gender:'男'
                },
                
            }
        })
        
    </script>
</body>
</html>